Micrometer-gage.



W. J. SMITH.

I MICROMETER GAGE.

' MPLICATION FILED AUG-3.1912- I Patented Feb. 27,1917.

'2 SHEETS-SHEET 1.

. W TNE'SSES '/NVENTO}? M JOHN'S/WITH w.-1. SMITH. 'MIQROMETER GAGE. APPkiCATION FILED AUG-3 l9l2.

Patented Feb2 7,19 17.

2 SHEETS-SHEET 2.

W/LL/H Vi JOHN MITH WILLIAM some smirk, on NEW nevnn, CONNECTICUT.

Application filed August 3, 1912; Serial N 0. 713,101.

T0 aJZZ uikom it may concern 4 1 Be it. known that IQVILLI'A J 01 n Sarina, a citizen of the-United-States, re'sidl-ng at United States of America, have-invented new and useful Improvements in M1crom-.

eter-Gages, of which the'following'is a specification.

My invention has for its object to, prov-ide-mic'rometer' gages'by which very accurate indications are obtained and the indi-- cations are very readily ascertained. Accordlng to my invention the indicating parts of. the gage consist of rotatable disks,- or dials,.marked.with indications de-' noting respectively any desired funits (say tenths of inches) and divisions of such units (say hundredths and thousandths), these disks, or dials, being operated through suitable pinions by a rack upon a bar such as has been proposed for, or used in, some gages and is movedlongitudinally by, or against, the, object to be measured asv distinguished from a screwing movement, the

operation of the said bar causing the indicating disks, or dia s, to beoperated so as to give the required indication ofmeas-' urement with great accuracy and so that it is easilyread. The operative parts are re,-

turned to their normal position by means of a spring. v I will describe, with reference to the accompanylng draw1ngs,- constructions of gages provided withdisks, or dials, in accordance with my mvention, but I do not limit myself to the precise details of construction illustrated.-

line a, a Fig. 4) of t Figure 1 is a plan of hue construction of gage, Fig. 2 is a side elevation with the cover removed, Fig. 3 is a plan, Fig. 4 a side-elevation, and Figf 5' asection (on the nism of the disks, or dials, Figs; 3, 4 and 5 being drawn to a'larger scale than Figs.

Figs. 6, 7 and 8 are respectively 1' and 2. a side, plan and end view of the device applied to the common form of micrometer s 3 1 is a casing, bored to truly receive the longitudinally slidabl e' bar. 2, which is formed with a rack.3. The casing 1 is of a known kind provided with fixed jaws 4s.

The opposite end of the casing 1 may be knurled so as to be more easily handled. -5.

is a casing fixed to,or formed in one with,

"MIcitoME'rER-GAGE. I

1e operating mecha-.

u-ated the indicating mechanism operated I by the rack 3. Spindles 6. and 7 are sup- 1435 Chapel street, in the city and county of New Havenfand State, of Connecticut,

ported by the casing 5. .On the spindle 6 f 'Patented F el at, {1917;

' thecasing 1,-within which casing 5, is 'sitof which are secured a toothed wheel '9, and, i

a tenths disk 10. The wheel 9.drives a pin ion 11 which is mounted OI1.' the spindle 7 the boss of the said pinion carryingat its opposite end a toothed wheel 12, which .en-

gages a pinion 13, loose on thespindle 6..

Secured to the boss of the pinion 13 is a hun dredths'disk 14:, the: subdivisions of which give the reading in thousandths of an inch.

The .inner -face of this disk'14 is recessed so as to :form anannular space within which is a coiled spring 15 one end of which is" fixed to a pin 16 carried'by the tenths disk 10, the-other end of the said spring being fixed to the boss of the pinion WVhen the object to be measured isin.- troduced betweenthe jaws and pressed in ward till it bears against them, the bar 2 is moved inward and the rack 3, through the gea'rlng described operates the twoinditions on the disks being so related to the angular space between-the jaws 4 that when the object is arrested by the jaws 4the true indication of the diameter of the object is eating disks,the gearing and the indicagiven by the indications which come in line with a pointer, or mark, on the casing 5, and are seen through the opening provided .for the purpose in the said casing.

' Figs. 6, 7 and-8 are respectively a side elevation, plan, and end view of the same arme'ntalso of a known kind with a fixed jaw 17, between which and the end of the bar 2 the object to be measured is placed,- the bar rangement of indicating disks, or dials, and operating mechanlsm applled to an instru- 2 being pressed) inward by simple longitudinal movement to come into contact with the side of the object opposite to that which bears against'the fixed jaw 17.

The parts which correspoi d with those shown in Figs. 1 to 5 are marked with the same reference numerals and require no further description. 7

hat I claim is 1. In a manually operated gage, a meas-' uring bar longitudinallydisplaceable, a rackon said bar, a pinion gearing with said rack, a plurality of indicator'dials arranged on a common axis and interconnecting gearing between said pininn and'dials, said gearing and pinion having their axes arranged on opposite sldes. of the measurmg bar, together with a spring tending to return sald bar and dials to normal position after displacement.

2. In a manually operated micrometer gage, a measuring bar longitudinally dislaceable a rack on said bar a inion earother end and serving .to return the bar and dials to normal position after displacement.

3. In a manually operated micrometer gage, a measuring'bar longitudinally displaceable, a rack on said bar, a pinion gearing With said rack, a plurality of operatively connected indicator dials juxtaposed on a common axis but formed with a recess between their adjacent faces to afford a chamher for an operating spring, together with a coil spring Within said chamber operatively connected to said parts in order to re turn said bar and dials to normal position after displacement.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses. 1 WILLIAM JOHN SMITH.

Witnesses:

GILBERT FLETCHER BYSON, EDWARD GEORGE DAVIES. 

